kernel: Null pointer dereference via keyctl
Published Nov 28, 2016
8.8
HIGHCVSS 3.0
EPSS 0.41%
Description
The mpi_powm function in lib/mpi/mpi-pow.c in the Linux kernel through 4.8.11 does not ensure that memory is allocated for limb data, which allows local users to cause a denial of service (stack memory corruption and panic) via an add_key system call for an RSA key with a zero exponent.
Affected products
No data.
- ≤ 4.8.11
No data.
Red Hat Enterprise Linux 6
kernel-0:2.6.32-754.el6
Fixed · RHSA-2018:1854
Red Hat Enterprise Linux 7
kernel-0:3.10.0-514.16.1.el7
Fixed · RHSA-2017:0933
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-514.16.1.rt56.437.el7
Fixed · RHSA-2017:0931
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-514.rt56.219.el6rt
Fixed · RHSA-2017:0932
Red Hat Enterprise Linux 5
kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel-0:2.6.32-754.el6 | Fixed | RHSA-2018:1854 |
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-514.16.1.el7 | Fixed | RHSA-2017:0933 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-514.16.1.rt56.437.el7 | Fixed | RHSA-2017:0931 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-514.rt56.219.el6rt | Fixed | RHSA-2017:0932 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7, MRG-2 and realtime kernels. This issue does not affect kernels that ship with Red Hat Enterprise Linux 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.41% (0.00406) | 32.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.41% (0.00406) | 32.13th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00045) | 10.93th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 13, 2023 | 1.28% (0.01282) | 67.79th | v2 (v2022.01.01) |
| Feb 3, 2023 | 1.55% (0.01547) | 74.40th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (15)
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f5527fffff3f002b0a6b376163613b82f69de073 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- http://seclists.org/fulldisclosure/2016/Nov/76 mailing-listx_refsource_FULLDISCMailing List
- http://www.openwall.com/lists/oss-security/2016/11/24/8 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/94532 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1037968 vdb-entryx_refsource_SECTRACK
- https://access.redhat.com/errata/RHSA-2017:0931 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2017:0932 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2017:0933 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2018:1854 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2016-8650 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1395187 x_refsource_CONFIRMIssue Tracking
- https://github.com/torvalds/linux/commit/f5527fffff3f002b0a6b376163613b82f69de073 x_refsource_CONFIRMIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2016-8650
- https://source.android.com/security/bulletin/2017-03-01.html x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-8650
Change history (0)
No recorded changes yet.